This　paper　reveals　the　applicability　and　mechanical　properties　of　mold　bag　in　fine　tailings　dam　by　filling　test,　compression　test　and　large-size　shear　test.　The　failure　modes　of　the　geofabriform　tailings　dam　are　analyzed　based　on　the　test　results.　And　the　rigid　limit　equilibrium　method　is　improved　by　regarding　the　mold　bags　as　the　slope　pressing　body,　thereby　preparing　calculation　program　of　the　safety　factors　of　the　geofabriform　tailings　dam　under　different　failure　modes.　Finally,　through　the　calculation　of　5　models　in　3　groups,　parameter　sensitivity　analysis　on　the　stability　of　the　geofabriform　tailings　dam　is　conducted.　The　study　shows,　mold　bags　have　remarkable　reinforcement　effect　on　tailings　dam.　The　smaller　the　height　of　the　geofabriform　tailings　dam,　the　more　gentle　the　slope　and　the　thicker　the　mold　bags　laid,　the　more　obvious　effect　of　mold　bags　on　improving　the　stability　of　dam　is.　The　result　has　guiding　significance　in　further　studies　on　mold　bag　fine　tailings　dam　and　its　engineering　application.　©　2015　ejge.